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研究了具有不同组织结构的铜合金管材在淡水中的腐蚀行为。合金存在大量粒径小于5μm的晶粒,且大小晶粒差别显著,表现为不完全再结晶的组织结构。大量细小晶粒的存在增加了铜合金在淡水中的腐蚀敏感性,主要表现为表面膜层不稳定、膜层鼓泡脱落、出现微裂纹和沿晶腐蚀。不完全再结晶的组织可以形成腐蚀通道,使合金的腐蚀迅速向纵深发展。这种组织来源于热加工中的动态再结晶过程,因某种原因保留到了冷加工及其热处理过程之后。
The corrosion behavior of copper alloy tubes with different microstructures in freshwater was studied. There are a large number of grain size less than 5μm grain size, and the size of the grain significant difference, the performance of incomplete recrystallization of the organizational structure. The presence of a large number of fine grains increases the corrosion sensitivity of copper alloys in freshwater, mainly due to the instability of the surface film layer, the bubbling of the film layer, the appearance of microcracks and the intergranular corrosion. Incomplete recrystallization of the organization can form corrosion channels, the corrosion of the alloy to the rapid development in depth. This organization comes from the dynamic recrystallization process in thermal processing, for some reason retained after cold working and its heat treatment process.